MFC訊息機制一
阿新 • • 發佈：2019-02-09
訊息對映值集合
enum AfxSig { AfxSig_end = 0, // [marks end of message map] AfxSig_bD, // BOOL (CDC*) AfxSig_bb, // BOOL (BOOL) AfxSig_bWww, // BOOL (CWnd*, UINT, UINT) AfxSig_hDWw, // HBRUSH (CDC*, CWnd*, UINT) AfxSig_hDw, // HBRUSH (CDC*, UINT) AfxSig_iwWw, // int (UINT, CWnd*, UINT) AfxSig_iww, // int (UINT, UINT) AfxSig_iWww, // int (CWnd*, UINT, UINT) AfxSig_is, // int (LPTSTR) AfxSig_lwl, // LRESULT (WPARAM, LPARAM) AfxSig_lwwM, // LRESULT (UINT, UINT, CMenu*) AfxSig_vv, // void (void) AfxSig_vw, // void (UINT) AfxSig_vww, // void (UINT, UINT) AfxSig_vvii, // void (int, int) // wParam is ignored AfxSig_vwww, // void (UINT, UINT, UINT) AfxSig_vwii, // void (UINT, int, int) AfxSig_vwl, // void (UINT, LPARAM) AfxSig_vbWW, // void (BOOL, CWnd*, CWnd*) AfxSig_vD, // void (CDC*) AfxSig_vM, // void (CMenu*) AfxSig_vMwb, // void (CMenu*, UINT, BOOL) AfxSig_vW, // void (CWnd*) AfxSig_vWww, // void (CWnd*, UINT, UINT) AfxSig_vWp, // void (CWnd*, CPoint) AfxSig_vWh, // void (CWnd*, HANDLE) AfxSig_vwW, // void (UINT, CWnd*) AfxSig_vwWb, // void (UINT, CWnd*, BOOL) AfxSig_vwwW, // void (UINT, UINT, CWnd*) AfxSig_vwwx, // void (UINT, UINT) AfxSig_vs, // void (LPTSTR) AfxSig_vOWNER, // void (int, LPTSTR), force return TRUE AfxSig_iis, // int (int, LPTSTR) AfxSig_wp, // UINT (CPoint) AfxSig_wv, // UINT (void) AfxSig_vPOS, // void (WINDOWPOS*) AfxSig_vCALC, // void (BOOL, NCCALCSIZE_PARAMS*) AfxSig_vNMHDRpl, // void (NMHDR*, LRESULT*) AfxSig_bNMHDRpl, // BOOL (NMHDR*, LRESULT*) AfxSig_vwNMHDRpl, // void (UINT, NMHDR*, LRESULT*) AfxSig_bwNMHDRpl, // BOOL (UINT, NMHDR*, LRESULT*) AfxSig_bHELPINFO, // BOOL (HELPINFO*) AfxSig_vwSIZING, // void (UINT, LPRECT) -- return TRUE // signatures specific to CCmdTarget AfxSig_cmdui, // void (CCmdUI*) AfxSig_cmduiw, // void (CCmdUI*, UINT) AfxSig_vpv, // void (void*) AfxSig_bpv, // BOOL (void*) // Other aliases (based on implementation) AfxSig_vwwh, // void (UINT, UINT, HANDLE) AfxSig_vwp, // void (UINT, CPoint) AfxSig_bw = AfxSig_bb, // BOOL (UINT) AfxSig_bh = AfxSig_bb, // BOOL (HANDLE) AfxSig_iw = AfxSig_bb, // int (UINT) AfxSig_ww = AfxSig_bb, // UINT (UINT) AfxSig_bv = AfxSig_wv, // BOOL (void) AfxSig_hv = AfxSig_wv, // HANDLE (void) AfxSig_vb = AfxSig_vw, // void (BOOL) AfxSig_vbh = AfxSig_vww, // void (BOOL, HANDLE) AfxSig_vbw = AfxSig_vww, // void (BOOL, UINT) AfxSig_vhh = AfxSig_vww, // void (HANDLE, HANDLE) AfxSig_vh = AfxSig_vw, // void (HANDLE) AfxSig_viSS = AfxSig_vwl, // void (int, STYLESTRUCT*) AfxSig_bwl = AfxSig_lwl, AfxSig_vwMOVING = AfxSig_vwSIZING, // void (UINT, LPRECT) -- return TRUE AfxSig_vW2, // void (CWnd*) (CWnd* comes from lParam) AfxSig_bWCDS, // BOOL (CWnd*, COPYDATASTRUCT*) AfxSig_bwsp, // BOOL (UINT, short, CPoint) AfxSig_vws, };
上面的這些值會在CMDTARG.CPP 檔案中的_AfxDispatchCmdMsg（）函式中用到
AFX_STATIC BOOL AFXAPI _AfxDispatchCmdMsg(CCmdTarget* pTarget, UINT nID, int nCode, AFX_PMSG pfn, void* pExtra, UINT nSig, AFX_CMDHANDLERINFO* pHandlerInfo) // return TRUE to stop routing { ASSERT_VALID(pTarget); UNUSED(nCode); // unused in release builds union MessageMapFunctions mmf; mmf.pfn = pfn; BOOL bResult = TRUE; // default is ok if (pHandlerInfo != NULL) { // just fill in the information, don't do it pHandlerInfo->pTarget = pTarget; pHandlerInfo->pmf = mmf.pfn; return TRUE; } switch (nSig) { case AfxSig_vv: // normal command or control notification ASSERT(CN_COMMAND == 0); // CN_COMMAND same as BN_CLICKED ASSERT(pExtra == NULL); (pTarget->*mmf.pfn_COMMAND)(); break; case AfxSig_bv: // normal command or control notification ASSERT(CN_COMMAND == 0); // CN_COMMAND same as BN_CLICKED ASSERT(pExtra == NULL); bResult = (pTarget->*mmf.pfn_bCOMMAND)(); break; case AfxSig_vw: // normal command or control notification in a range ASSERT(CN_COMMAND == 0); // CN_COMMAND same as BN_CLICKED ASSERT(pExtra == NULL); (pTarget->*mmf.pfn_COMMAND_RANGE)(nID); break; case AfxSig_bw: // extended command (passed ID, returns bContinue) ASSERT(pExtra == NULL); bResult = (pTarget->*mmf.pfn_COMMAND_EX)(nID); break; case AfxSig_vNMHDRpl: { AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra; ASSERT(pNotify != NULL); ASSERT(pNotify->pResult != NULL); ASSERT(pNotify->pNMHDR != NULL); (pTarget->*mmf.pfn_NOTIFY)(pNotify->pNMHDR, pNotify->pResult); } break; case AfxSig_bNMHDRpl: { AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra; ASSERT(pNotify != NULL); ASSERT(pNotify->pResult != NULL); ASSERT(pNotify->pNMHDR != NULL); bResult = (pTarget->*mmf.pfn_bNOTIFY)(pNotify->pNMHDR, pNotify->pResult); } break; case AfxSig_vwNMHDRpl: { AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra; ASSERT(pNotify != NULL); ASSERT(pNotify->pResult != NULL); ASSERT(pNotify->pNMHDR != NULL); (pTarget->*mmf.pfn_NOTIFY_RANGE)(nID, pNotify->pNMHDR, pNotify->pResult); } break; case AfxSig_bwNMHDRpl: { AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra; ASSERT(pNotify != NULL); ASSERT(pNotify->pResult != NULL); ASSERT(pNotify->pNMHDR != NULL); bResult = (pTarget->*mmf.pfn_NOTIFY_EX)(nID, pNotify->pNMHDR, pNotify->pResult); } break; case AfxSig_cmdui: { // ON_UPDATE_COMMAND_UI or ON_UPDATE_COMMAND_UI_REFLECT case ASSERT(CN_UPDATE_COMMAND_UI == (UINT)-1); ASSERT(nCode == CN_UPDATE_COMMAND_UI || nCode == 0xFFFF); ASSERT(pExtra != NULL); CCmdUI* pCmdUI = (CCmdUI*)pExtra; ASSERT(!pCmdUI->m_bContinueRouting); // idle - not set (pTarget->*mmf.pfn_UPDATE_COMMAND_UI)(pCmdUI); bResult = !pCmdUI->m_bContinueRouting; pCmdUI->m_bContinueRouting = FALSE; // go back to idle } break; case AfxSig_cmduiw: { // ON_UPDATE_COMMAND_UI case ASSERT(nCode == CN_UPDATE_COMMAND_UI); ASSERT(pExtra != NULL); CCmdUI* pCmdUI = (CCmdUI*)pExtra; ASSERT(pCmdUI->m_nID == nID); // sanity assert ASSERT(!pCmdUI->m_bContinueRouting); // idle - not set (pTarget->*mmf.pfn_UPDATE_COMMAND_UI_RANGE)(pCmdUI, nID); bResult = !pCmdUI->m_bContinueRouting; pCmdUI->m_bContinueRouting = FALSE; // go back to idle } break; // general extensibility hooks case AfxSig_vpv: (pTarget->*mmf.pfn_OTHER)(pExtra); break; case AfxSig_bpv: bResult = (pTarget->*mmf.pfn_OTHER_EX)(pExtra); break; default: // illegal ASSERT(FALSE); return 0; } return bResult; }
但是注意：上面的函式中會出現MessageMapFunctions這麼一個列舉型別的結構體型結構，一般F12是定位不到他的定義的，其實他是在AFXIMPL.H 檔案中定義的
MessageMapFunctions結構體中實際上定義的是一些函式的指標
union MessageMapFunctions { AFX_PMSG pfn; // generic member function pointer // specific type safe variants for WM_COMMAND and WM_NOTIFY messages void (AFX_MSG_CALL CCmdTarget::*pfn_COMMAND)(); BOOL (AFX_MSG_CALL CCmdTarget::*pfn_bCOMMAND)(); void (AFX_MSG_CALL CCmdTarget::*pfn_COMMAND_RANGE)(UINT); BOOL (AFX_MSG_CALL CCmdTarget::*pfn_COMMAND_EX)(UINT); void (AFX_MSG_CALL CCmdTarget::*pfn_UPDATE_COMMAND_UI)(CCmdUI*); void (AFX_MSG_CALL CCmdTarget::*pfn_UPDATE_COMMAND_UI_RANGE)(CCmdUI*, UINT); void (AFX_MSG_CALL CCmdTarget::*pfn_OTHER)(void*); BOOL (AFX_MSG_CALL CCmdTarget::*pfn_OTHER_EX)(void*); void (AFX_MSG_CALL CCmdTarget::*pfn_NOTIFY)(NMHDR*, LRESULT*); BOOL (AFX_MSG_CALL CCmdTarget::*pfn_bNOTIFY)(NMHDR*, LRESULT*); void (AFX_MSG_CALL CCmdTarget::*pfn_NOTIFY_RANGE)(UINT, NMHDR*, LRESULT*); BOOL (AFX_MSG_CALL CCmdTarget::*pfn_NOTIFY_EX)(UINT, NMHDR*, LRESULT*); // type safe variant for thread messages void (AFX_MSG_CALL CWinThread::*pfn_THREAD)(WPARAM, LPARAM); // specific type safe variants for WM-style messages BOOL (AFX_MSG_CALL CWnd::*pfn_bD)(CDC*); BOOL (AFX_MSG_CALL CWnd::*pfn_bb)(BOOL); BOOL (AFX_MSG_CALL CWnd::*pfn_bWww)(CWnd*, UINT, UINT); BOOL (AFX_MSG_CALL CWnd::*pfn_bHELPINFO)(HELPINFO*); BOOL (AFX_MSG_CALL CWnd::*pfn_bWCDS)(CWnd*, COPYDATASTRUCT*); HBRUSH (AFX_MSG_CALL CWnd::*pfn_hDWw)(CDC*, CWnd*, UINT); HBRUSH (AFX_MSG_CALL CWnd::*pfn_hDw)(CDC*, UINT); int (AFX_MSG_CALL CWnd::*pfn_iwWw)(UINT, CWnd*, UINT); int (AFX_MSG_CALL CWnd::*pfn_iww)(UINT, UINT); int (AFX_MSG_CALL CWnd::*pfn_iWww)(CWnd*, UINT, UINT); int (AFX_MSG_CALL CWnd::*pfn_is)(LPTSTR); LRESULT (AFX_MSG_CALL CWnd::*pfn_lwl)(WPARAM, LPARAM); LRESULT (AFX_MSG_CALL CWnd::*pfn_lwwM)(UINT, UINT, CMenu*); void (AFX_MSG_CALL CWnd::*pfn_vv)(void); void (AFX_MSG_CALL CWnd::*pfn_vw)(UINT); void (AFX_MSG_CALL CWnd::*pfn_vww)(UINT, UINT); void (AFX_MSG_CALL CWnd::*pfn_vvii)(int, int); void (AFX_MSG_CALL CWnd::*pfn_vwww)(UINT, UINT, UINT); void (AFX_MSG_CALL CWnd::*pfn_vwii)(UINT, int, int); void (AFX_MSG_CALL CWnd::*pfn_vwl)(WPARAM, LPARAM); void (AFX_MSG_CALL CWnd::*pfn_vbWW)(BOOL, CWnd*, CWnd*); void (AFX_MSG_CALL CWnd::*pfn_vD)(CDC*); void (AFX_MSG_CALL CWnd::*pfn_vM)(CMenu*); void (AFX_MSG_CALL CWnd::*pfn_vMwb)(CMenu*, UINT, BOOL); void (AFX_MSG_CALL CWnd::*pfn_vW)(CWnd*); void (AFX_MSG_CALL CWnd::*pfn_vWww)(CWnd*, UINT, UINT); void (AFX_MSG_CALL CWnd::*pfn_vWp)(CWnd*, CPoint); void (AFX_MSG_CALL CWnd::*pfn_vWh)(CWnd*, HANDLE); void (AFX_MSG_CALL CWnd::*pfn_vwW)(UINT, CWnd*); void (AFX_MSG_CALL CWnd::*pfn_vwWb)(UINT, CWnd*, BOOL); void (AFX_MSG_CALL CWnd::*pfn_vwwW)(UINT, UINT, CWnd*); void (AFX_MSG_CALL CWnd::*pfn_vwwx)(UINT, UINT); void (AFX_MSG_CALL CWnd::*pfn_vs)(LPTSTR); void (AFX_MSG_CALL CWnd::*pfn_vOWNER)(int, LPTSTR); // force return TRUE int (AFX_MSG_CALL CWnd::*pfn_iis)(int, LPTSTR); UINT (AFX_MSG_CALL CWnd::*pfn_wp)(CPoint); UINT (AFX_MSG_CALL CWnd::*pfn_wv)(void); void (AFX_MSG_CALL CWnd::*pfn_vPOS)(WINDOWPOS*); void (AFX_MSG_CALL CWnd::*pfn_vCALC)(BOOL, NCCALCSIZE_PARAMS*); void (AFX_MSG_CALL CWnd::*pfn_vwp)(UINT, CPoint); void (AFX_MSG_CALL CWnd::*pfn_vwwh)(UINT, UINT, HANDLE); BOOL (AFX_MSG_CALL CWnd::*pfn_bwsp)(UINT, short, CPoint); void (AFX_MSG_CALL CWnd::*pfn_vws)(UINT, LPCTSTR); };
其中AFX_PMSG這個結構的定義是在AFXWIN.H 檔案中定義的
typedef void (AFX_MSG_CALL CCmdTarget::*AFX_PMSG)(void);通過以上的這些資料和函式MFC把其內部凌亂的流程函式全部都進行了整理、彙總；但是請注意：_AfxDispatchCmdMsg雖然是一個MFC的全域性函式但是MessageMapFunctions結構中的函式指標所指向的大多數都是CCmdTarget類中的函式，可見CCmdTarget類對前期流程控制的重要性